<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ page import="java.util.List" %>
<%@ page isELIgnored="false"%>
My JSP 'ADMIN_ClientManager.jsp' starting page
<% System.out.println(((List)request.getAttribute("clientList")).isEmpty());%>
#{clientList}